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Lens barrel and photographing apparatus

a technology of lens barrel and photographing apparatus, which is applied in the direction of mountings, instruments, optics, etc., can solve the problems of complex mechanism and difficulty in compact arm length corresponding to the reduced siz

Inactive Publication Date: 2010-01-26
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This design achieves a compact, simple, and efficient lens barrel structure that can collapse effectively, accommodating high magnification zoom lenses while maintaining a square shape compatible with the image pickup element, addressing the complexity and size constraints of previous designs.

Problems solved by technology

However, in the posture restraining mechanism of the movable frame described in Japanese Patent No. 3666207, a structure is described in which one movable frame can move with respect to the stationary main frame, but in order to be usable with the high magnification zoom lens of recent years, it is necessary, for example, to increase the length of the arm portion in order to match the zooming mechanism which moves the zoom lens group toward the object side in large dimensions that is closest to the object of the zoom lens and it thus difficult for the length of the arm to be made compact corresponding to the reduced size of the zoom lens.
In addition, the two-group type zooming device described in Unexamined Japanese Patent Application Publication No. 06-324247, is a three unit structure, but it is necessary to form helicoid grooves on the inner surface of the stationary barrel and the middle barrel, and it is also necessary to form helicoid grooves on the end outer surface of the middle barrel and the end outer surface of the movable barrel which engage with these, and thus the mechanism becomes complex.

Method used

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  • Lens barrel and photographing apparatus
  • Lens barrel and photographing apparatus
  • Lens barrel and photographing apparatus

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0042]The structure of the lens unit 12 is described as the first embodiment.

[0043]FIG. 3 is front view of the lens unit 12 in the wide-angle state; FIG. 4 is a side view of the lens unit 12 in the wide-angle state; FIG. 5 is a side view of the lens unit 12 in the telephoto state; FIG. 6 and FIG. 7 show a side view and top view of the first holding member when collapsed or at the position where the first holding member is moved at startup time (bending member inserting and removing position); FIG. 8, FIG. 9 and FIG. 10 respectively show a front view, a side view and a top view of the collapsed state. The side view is used for describing the first moving member for zooming and the first lens group and does not show the bending member, and the second and third lens groups.

[0044]First, the structure of the lens unit 12 will be described using FIG. 3 to FIG. 5.

[0045]Starting from the object side, the photographing lens comprises a first lens group 81, a mirror 85 as the bending member, ...

second embodiment

[0072]The structure of the lens unit 30 is described as the second embodiment.

[0073]FIG. 12 is front view of the lens unit 30 in the wide angle state; FIG. 13 is a side view of the lens unit 30 in the wide angle state; FIG. 14 is a side view of the lens unit 30 in the telephoto state; FIG. 15 is a top view of the lens unit 30 in the wide angle state; FIG. 16 is a top view of the lens unit 30 in the telephoto state; FIG. 17 is a main portion showing the front in the collapsed state and the retreat state of the bending section holding member; FIGS. 18 and 19 respectively show side view and the top view in the collapsed state. The side view is used for describing the movement of the first zooming and moving member and the first lens group without showing the second and third lens group. It is to be noted that the members which have the same functions as the first embodiment have been assigned the same reference numbers and descriptions thereof are not repeated.

[0074]The differences bet...

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PUM

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Abstract

A lens barrel is provided with: a first movable frame and a second movable frame of a plurality of movable frames that are coaxially disposed to be movable back and forth to a stationary main frame and are inserted telescopically into the stationary frame; and two U-shaped support and drive members each having a first engagement portion, wherein each of the support and drive members is constituted of two arm portions, a second engagement portion, and a coupling member which connects the two arm portions. The first movable frame is driven by one of the support and drive members, and the second movable frame and the first movable frame are engaged with each other.

Description

[0001]This application is based on Japanese Patent Application No. 2006-225122 filed on Aug. 22, 2006, which is incorporated hereinto by reference.BACKGROUND OF THE INVENTION[0002]This invention relates to a lens unit and a photographing apparatus, and relates in particular to a lens unit equipped with a zooming mechanism of a bending optical system.[0003]In recent years, as personal computers have become more widely used, digital cameras in which images can be easily taken in to personal computers have also become widespread. In addition, it is becoming commonplace for digital cameras to be incorporated into information processing devices such as mobile computers, cellular phones, and personal digital assistants (PDAs). As digital cameras have become more widespread, there has been a desire for more compact digital cameras, and the lens unit needs to be even more compact. There is also a demand for a high magnification zoom lens and a zooming mechanism that can be used with the hig...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B15/14
CPCG02B7/026
Inventor MATSUI, KAZUAKIMITANI, YOSHIFUMI
Owner KONICA MINOLTA OPTO